介绍你来这里转转:http://www.phpzc.com,或许你会有意想不到的收获首先是创建MYSQL数据库表。CREATE TABLE tablename ( field type(max_length) DEFAULT 'default_value' (NOT) NULL } 可以使用的SQL语句。CREATE TABLE useronline ( times****p int(15) DEFAULT '0' NOT NULL, ip varchar(40) NOT NULL, file varchar(100) NOT NULL, PRIMARY KEY (times****p), KEY ip (ip), KEY file (file) ); 下面我们开始使用PHP脚本,首先定义MYSQL的信息。$server = "localhost"; //你的服务器 $db_user = "root"; //你的mysql的用户名 $db_pass = "password"; //你的mysql的密码 $database = "users"; //表的名字 设置统计的时间(多少秒内在线人数)$timeoutseconds = 300; 取当前时间。$times****p = time(); 上面的完整代码:<?php $server = "localhost"; //your server $db_user = "root"; //your mysql database username $db_pass = "password"; //your mysql database password if any $database = "users"; //the db name $timeoutseconds = 300;//timeoutseconds limit //get the current time $times****p = time(); //calculate the lowest times****p allowed $timeout = $times****p-$timeoutseconds; ?> 连接mysqlmysql_connect('localhost', 'username', 'password'); 也允许使用变量形式。mysql_connect($server, $db_user, $db_pass); 如果mysql数据库没有密码的话可以使用下面代码连接(当然建议大家一定要设置好自己的密码,这样起码黑客得要解密啊)mysql_connect($server, $db_user); 查询数据库的代码:mysql_db_query('database', 'query'); 我们只要有访客就要增加一条记录。$insert = mysql_db_query($database, "INSERT INTO useronline VALUES ('$times****p','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')"); 然后我们给出如果用户用错误信息的处理方式。if(!($insert)) { print "Useronline Insert Failed > "; } 然后我们得实现当超过我们设置的时间我们就要删除该用户记录。$delete = mysql_db_query($database, "DELETE FROM useronline WHERE times****p<$timeout"); 同样给出删除记录出错的处理。if(!($delete)) { print "Useronline Delete Failed > "; } 下面我们显示数据库中有多少个不同的IP$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' "); 我们使用mysql_num_rows(query); 来统计用户,代码如下。$user = mysql_num_rows($result); 最后我们要关闭数据库。mysql_close(); 显示在线的人数。if($user == 1) { print("1 user online\n"); } else { print("$user users online\n"); } 最终把上面代码写成一个PHP文件如下。<?php //Put your basic server info here $server = "localhost"; //normally localhost $db_user = "root"; //your MySQL database username $db_pass = "password"; //your MySQL database password $database = "users"; $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last // $timeoutseconds seconds) //this is where PHP gets the time $times****p = time(); //counts the timeout, all people which have been seen last online in earlier than this times****p, will get removed $timeout = $times****p-$timeoutseconds; //connect to database mysql_connect($server, $db_user); //add the times****p from the user to the online list $insert = mysql_db_query($database, "INSERT INTO useronline VALUES ('$times****p','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')"); if(!($insert)) { print "Useronline Insert Failed > "; } //delete the peoples which haven't been online/active in the last $timeoutseconds seconds. $delete = mysql_db_query($database, "DELETE FROM useronline WHERE times****p<$timeout"); if(!($delete)) { print "Useronline Delete Failed > "; } //select the amount of people online, all uniques, which are online on THIS page $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' "); if(!($result)) { print "Useronline Select Error > "; } //Count the number of rows = the number of people online $user = mysql_num_rows($result); //spit out the results mysql_close(); if($user == 1) { print("1 user online\n"); } else { print("$user users online\n"); } ?>
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}
可以使用的SQL语句。CREATE TABLE useronline (
times****p int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (times****p),
KEY ip (ip),
KEY file (file)
);
下面我们开始使用PHP脚本,首先定义MYSQL的信息。$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码
$database = "users"; //表的名字
设置统计的时间(多少秒内在线人数)$timeoutseconds = 300;
取当前时间。$times****p = time();
上面的完整代码:<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$times****p = time();
//calculate the lowest times****p allowed
$timeout = $times****p-$timeoutseconds;
?>
连接mysqlmysql_connect('localhost', 'username', 'password');
也允许使用变量形式。mysql_connect($server, $db_user, $db_pass);
如果mysql数据库没有密码的话可以使用下面代码连接(当然建议大家一定要设置好自己的密码,这样起码黑客得要解密啊)mysql_connect($server, $db_user);
查询数据库的代码:mysql_db_query('database', 'query');
我们只要有访客就要增加一条记录。$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$times****p','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
然后我们给出如果用户用错误信息的处理方式。if(!($insert)) {
print "Useronline Insert Failed > ";
}
然后我们得实现当超过我们设置的时间我们就要删除该用户记录。$delete = mysql_db_query($database, "DELETE FROM useronline WHERE times****p<$timeout");
同样给出删除记录出错的处理。if(!($delete)) {
print "Useronline Delete Failed > ";
}
下面我们显示数据库中有多少个不同的IP$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
我们使用mysql_num_rows(query);
来统计用户,代码如下。$user = mysql_num_rows($result);
最后我们要关闭数据库。mysql_close();
显示在线的人数。if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}
最终把上面代码写成一个PHP文件如下。<?php
//Put your basic server info here
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
// $timeoutseconds seconds)
//this is where PHP gets the time
$times****p = time();
//counts the timeout, all people which have been seen last online in earlier than this times****p, will get removed
$timeout = $times****p-$timeoutseconds;
//connect to database
mysql_connect($server, $db_user);
//add the times****p from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$times****p','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE times****p<$timeout");
if(!($delete)) {
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS page
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results
mysql_close();
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}
?>